What about link-layer distinguisher of IP version?|
4.2. IP Header Fields
The metering process MUST, SHOULD, or MAY be able to separate flows by the following fields of the IP header as indicated.
1. source IP address (MUST)
2. destination IP address (MUST)
3. protocol type (TCP,UDP,ICMP,...) (MUST)
4. IP version number (SHOULD)
This requirement only applies if the observation point is located at a device that is supporting more than IP version.
For source address and destination address, separating by full match MUST be supported as well as separation by prefix match.